Can the packaging be customized?

Yes, we offer bulk, bundles with metal belts, or packaging tailored to customer requirements.

What steel grades are available?

Available grades include Q195, Q235, Q345, Grade B, and others upon request.

What is the thickness tolerance?

Tolerance is +/-0.02mm for 0.5-1.2mm, +/-0.03mm for 1.2-2.0mm, +/-5% for 2.0-3.0mm, and +/-10% for 3.0-16mm.

Square Hollow Section Black Welded Tube

Name: Square Hollow Section Black Welded Tube
Brand: Guangzhou New Zhonglian Building Materials Co., Ltd.
SKU: 769114075

Guangdong, ChinaGuangzhou New Zhonglian Building Materials Co., Ltd.

US$600.00

10 Tons

Product profile

Customization

Available

Type

Welded

Technique

ERW

Model NO.

ZL-BT

Material

Carbon Steel

Surface Treatment

Black

Usage

Construction & Decoration

Section Shape

Square

Surface

Black, Bright, Zinc Coating

Square Section

13X13mm - 400X400mm

Rectangle Section

10X20mm - 300X400mm

Transport Package

Bundle

Origin

Hebei

Production Capacity

10000tons/ Month

Key features

Wide Size Range: Square section 13x13mm to 400x400mm, thickness 0.4-16mm.

Multiple Surface Options: Available in Black, Bright, Zinc Coating, Pre-galvanized, and Galvanized.

Diverse Material Grades: Supports Q195, Q235, Q345, Grade B, and other custom steel grades.

Strict Thickness Tolerance: Precision control: +/-0.02mm for 0.5-1.2mm, up to +/-10% for 3.0-16mm.

Flexible Packaging: Bulk, bundles with metal belts, or customized packaging per customer requirements.

Fast Delivery: 15-30 days lead time, within 15 workdays during off-peak season.

High Bendability: Bend degree capability of 90 degrees or more for versatile applications.

Company profile

Importers and ExportersHigh Repeat Buyers ChoiceYears of Export ExperienceExhibition Experience

Guangzhou New Zhonglian Building Materials Co., Ltd.

Guangdong, China

Business Type: Manufacturer/Factory, Trading Company, Group CorporationExport Year: 2000-09-01Nearest Port: Guangzhou, Shenzhen, FoshanAverage Response Time: ≤24hTerms of Payment: LC, T/T, D/P, etc.International Commercial Terms(Incoterms): FOB, CIF, EXW

AI-Powered supplier vetting

SummaryGuangzhou New Zhonglian Building Materials Co., Ltd. is a China-based limited company identified as both a trading company and manufacturer/factory. It offers steel structures, building materials, prefab and container houses, and related products. The supplier reports 13 years as an audited Alibaba Gold Supplier, ISO 9000 and ISO 9001 certifications, six to ten quality-control staff, two production lines, broad export coverage, and a typical off-peak lead time within 15 working days. Its business scope includes engineering construction, materials procurement, whole-house customization, soft furnishing, and after-sales service. However, the provided information does not verify detailed production ownership, financial strength, R&D deliverables, OEM/ODM services, raw-material traceability, or specific customer projects. The SGS audit record shown expired on 2025-08-22, and its evaluation result is recorded as 0 without an explanatory interpretation.

Supplier typeThe supplier is registered in Guangzhou, China, as a limited company, while its business classification identifies it as a trading company, manufacturer/factory, and group corporation. The available information therefore supports a mixed trading-and-manufacturing profile rather than a purely manufacturing identity.

CertificationsThe supplier reports ISO 9000 and ISO 9001 management-system certifications, and an SGS audit was conducted beginning 2024-08-23. However, the SGS record expired on 2025-08-22, so the available evidence does not establish current SGS validity.

After-Sales capabilityThe company description explicitly includes after-sales service for customers. Nevertheless, the slices provide no details on service staffing, response times, warranty procedures, spare parts, or overseas service arrangements; overseas warehouse and showroom capabilities are marked unknown.

Production capacityThe supplier reports two production lines, six to ten quality-control staff, exports to multiple global regions, and an off-peak lead time within 15 working days. Its profile combines manufacturing and trading roles, but the slices do not clarify owned-factory capacity, production volume by product, or raw-material traceability.

Customization capabilityThe company explicitly offers whole-house customization and supplies product categories including steel structure buildings, prefab houses, capsule houses, and container houses. This supports customization capability at the project or product-solution level, although specific design resources, customization limits, and execution processes are not provided.